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Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
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El "diploide obligatorio" de Candida albicans forma haploides capaces de aparearse entre sí
Meleah A Hickman1, Guisheng Zeng, Anja Forche
1Department of Genetics, Cell Biology & Development, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Nature
|February 1, 2013
Resumen
El patógeno fúngico Candida albicans puede existir en un estado haploide viable, desafiando su larga clasificación diploide. Esta forma haploide puede volver a la diploidía, ofreciendo nuevas vías para la investigación genética.
Área de la Ciencia:
- Microbiología Microbiología.
- La micología de la micología.
- Genética La genética.
Sus antecedentes:
- Candida albicans es un patógeno fúngico humano prevalente.
- Anteriormente se consideraba un organismo diploide obligado.
- Se cree que las mutaciones letales recesivas están muy extendidas en su genoma.
Objetivo del estudio:
- Investigar la existencia y las características de un estado haploide en Candida albicans.
- Explorar los mecanismos de formación haploide y sus implicaciones para la biología fúngica.
- Desarrollar cepas haploides estables para un análisis genético mejorado.
Principales métodos:
- Derivación de Candida albicans haploide de células diploides bajo condiciones in vitro e in vivo.
- Análisis de los cambios morfogenéticos en las células haploides, incluida la transición levadura-hifa y el cambio blanco-opaco.
- Evaluación de la eficiencia de apareamiento entre las células haploides y la regeneración de la forma diploide.
- Construcción de cepas haploides estables con múltiples auxotropías.
Principales resultados:
- Candida albicans demostró un estado haploide viable que surge de la pérdida de cromosomas.
- Las células haploides exhibieron capacidades morfogenéticas conservadas, incluido el apareamiento.
- Las células haploides se aparearon eficientemente para regenerar la diploidía, restaurando la heterocigosidad y la aptitud.
- Los diploides homocigotos surgieron espontáneamente, pero mostraron una aptitud reducida, lo que indica una estabilidad transitoria.
- Se crearon con éxito cepas haploides auxotróficas estables.
Conclusiones:
- Candida albicans posee una fase haploide viable, contrariamente a las suposiciones anteriores.
- El estado haploide es morfogenéticamente versátil y capaz de una eficiente restauración diploide.
- El desarrollo de cepas haploides estables avanza significativamente la manipulación genética y el estudio de este patógeno.
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